Feeding mechanism for sewing-machines



W. A. MACK. y FBEDING MEGHANISM FOR SEWING MACHINES.

No. 447,251. Patented Feb. 24, 1891.

(Model.) '2 Sheets-Sheet 2.

W. A. MACK. PEEDING MECHANISM FR SEWING MACHINES. NO.' 447,251. PatentedFeb. 24,1891.

y F\ A UNITED STATES IVILLIAM MACK, OF NORVALK, SEWING MACHINEPATENTuOrrIcE.

OHIO, ASSIGNOR TO THESTANDARD COMPANY, OF OHIO.

FEEDING MECHANISNI FOR SEWING-MACHINES.

SPECIFICATION farming pari of Letters 'raient No. 447,251, dated''February 24, 1891.

origina appiicaion inea April 25, 1885. seria no. 163,365.

To all whom it may concern.-

Be it known that I, WILLIAM A. MACK, a citizen of the UnitedStates,yresiding in the city of Norwalk, county of Huron, and' State of Ohio,have invented certain new and useful Improvements in Feeding Mechanismfor Sewing-Machines, of which the following, taken in connection withthe drawings, is a specification. n

My invention, which forms one of the several divisions of myapplication, No. 163,395, filed April 25, 1885, all relating tosewing-machin es, relates more lparticularly to the feeding mechanismwhereby the material to be stitched or otherwise operated upon is fedalong over the clothlate of the machine; and it consists, first, in themechanism and lneans for operating the same whereby the said mechanismas a whole is greatly simplilied and unnecessary friction avoided;second, in the means and arrangements of parts whereby the stitch isvaried in length, and, third, in the means for adjusting the uppersurface of the feed-dog either up or down, whereby the removal of partsfor such adjustment may be avoided, and in other combinationshereinafter detailed, and more specifically pointed out in the claims;

Referring to the drawings, Figure 1 represents a portion of the underside of the bedplate of a sewing-machine exposing to view thedriving-shaft and the lever for operating the feed mechanism. Fig 2represents an end view of the several operating parts, consisting of thefeed-dog,feed-adjusting device, operating-levers, dro., partlyin'section and in dotted lines, showing the arrangement of the same.Fig. 3 represents a top view, with a section of the bed-plate removed,of the serrated feed-dog, rock-shaft levers, adjusting nut or screw forregulating the stitch, &c., partly in section. Fig. 4 represents abottom yview, partly in section, of the feed-bar and its adjustingmechanism. Fig. 5 represents a side view of a part of the feed-adjustingdeand Figs. 6, l'7, S, and 9 are views of detached parts of thefeed-adjusting-device, all to be referred to hereinafter. Fig. 10represents a top View in perspective with the bed-plate of the machine176,879.'Y tModel.) l

Divided and this application filed September 12, 1885.r Serial No.

removed, showing the arrangement of the various rock-shafts and theconnections through. which they are operated.l Y

In the drawings, A is the cloth-plate of the sewing-machine.

B is a driving-shaft adapted to rotate and impart motion to sundryoperative parts in connection with the feeding mechanism, said shaftbeing arranged in position beneath the cloth-plate A and operatedvthrough the medium of suitable connection by another shaft. (Not shownin the drawings.)

O is a feed-bar. (Shown in det-ail in Figs. 2 and 3.)

D is a rock-shaft having its bearings in lugs or projections located onthe under side vof the cloth-plate A, asinore clearly shown in Fig. 4,and having connection with the said feed-bar O at one end thereof by anarm-andpivot connection, as more clearly shown at D in Figs. 4 and-10.The saidroclr-shaft D is actuated by the driving-shaft B through themedium of a cam or eccentric located thereon and .a connecting-rod B',aswill be explained. The said connecting-rodB has connection at one endwith a cam or' eccentric located on the driving-shaft', by which it isoperated, as before described, and at its opposite end is provided witha threaded opening adapted to be engaged by the threaded end of anadjusting device F. Said adj usting device consists of an enlarged headlocated within and adapted lto be operated by a hollow sleeve-likedevice or screw F, as will hereinafter be more fully described, and isprovided with a threaded stemadapted to engage with the threaded openingin the end of the said connecting-rod B', (see Fig. 9,) as beforedescribed. The said, sleeve-like device F is held in a stationary orfixed position laterally to one side of the cloth-plate of thesewing-macliine-in the present instance by a pin g, as more clearlyshown in Figs. 3 and 4, which engages a slot h in the periphery of theroughened head of said device F in a manner to allow the latter to beturned or revolved. It is obvious, however, thatother means might beemployed to hold and retain said screw F in a fixed position laterallyin lieu of the pin g without departing from the roo spirit of myinvention. The said sleeve-like device or screw F is provided with alongitudinal slot in its interior wall, in which a pin or projectionlocated on the head of said adjusting device Fextends, as clearly shownin Fig. 9, and by means of which the said adjusting device F may berevolved or turned by the sleeve or screw F, and at the same time beallowed to be drawn or moved backward or forward longitudinally, as willappear obvious, by means of its threaded stem cn gagin g the threadedopening in the end of the connecting-lever B.

The rock-shaft D is provided with an arm at one end thereof, which hasaloose connection with the said adjusting device F between its enlargedhead and the head or end of the connecting-rod B. (See Figs. 2 and 3.)'lhus by turning the sleeve orscrew F in the proper direction the headof the device F is drawn either backward or forward to val'y the spacebetween the same and the end of theconnecting-rod B', between which thearm of the rock-shaft D extends, and, according to the amount of spacebetween the two said heads, the throw of the arm or projection on therock-shaft is varied according to the amount of lost motion, thusregulating the throw of the rock-shaft D and the feed-bar, which isconnected to the opposite end of said shaft, as before explained.

E represents another rock-shaft,supported and held in position by twolugs or flanges located on the underside of the cloth-plate A, and isprovided at or near its front end with an arm E', which projects beneaththe feedbar C and is provided with a recess therein, adapted for thereception of a roller e for contact with the under side of saidfeed-bar, as more clearly shown in Fig. 2, to support and lift the sameand allow it to fall at the proper time. Said shaftE maybe operated by acam upon the drivin g-shaft B, through the medium of a hinged deviceconsisting of parts I and J, (detail views of the same being shown inFigs. 5, 6, and 7,) as will hereinafter be set forth. In this particularinstance, however, the camA for actuating the lever E th rough themedium of parts I and J is formed upon the hub of a shuttle-driver (at13) of the rotary-shuttle class. Said hinged or adjusting deviceconsists of an arm or extension J of the shaft E, (see Fig. 7,) to thefree end of which an elbowlever I, at its angle or elbow, is pivotallysecured, as more clearly shown in Fig. 5. One end of said lever I isconnected to the arm J by an adj listing-screw K, as clearly shown insaid Fig. 5, and a coiled spring is interposed between the samefor thepurpose, as will hereinafter appear obvious, and said lever I, at itsopposite or free end, is provided with a roller adapted for contact withthe said cam, located on the driving shaft or hub of the shuttle-driver,and by which action the shaft E receives its rocking motion to operatethe arm E', located on its opposite end thereof, which at its free endengages the under side of the feed-bar and gives the latter itsupand-down motion.

By turning the screw K in the proper direction it serves to bring theend of said arm or lever I into a greater or less degree of contact withthe said cam on the driving-shaft, and thereby adjusts the throw of theshaft E and regulates the vertical or up-anddown throw of the feed-bar,as will appear obvious.

Having thus set forth my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is

l. The combination, in a sewing-machine provided with a maindriving-shaft carrying a shuttle and an eccentric or cam, areciprocating feed-dog having connection with and operated byarock-shaft, and a reciprocating connecting-rod having connection at oneend with said cam or eccentric on the drivingsha-ft and at its oppositeend provided with an adjusting device, substantially as de'- scribed,for adjustable connection with said rock-shaft or part thereof, of asecondary rock-shaft provided at or near one end with an arm orextension for engagement with the feed-dog to give the latter itsup-and-down motion, and at or near its opposite end is provided with apivoted lever and an adjustingscrew for the latter to adjust its freeend, which is engaged by a cam or eccentric on the dl'ivingsllaft,substantially as described, and for the purpose set forth.

2. The combination, in a sewing-machine, with a driving-shaft providedwith a cam or eccentric thereon and a feed-dog horizontally reciprocatedby said `driving-shaft through the medium of a rock-shaft, a rodconnecting said rock-shaft and the said cam or eccentric, saidconnecting-rod being provided with a shoulder or projection, and anadjusting-screw adapted to engage with an arm of said rock-shaft tooperate the latter, of a secondary rock-shaft provided with an arm forengagement with the feed-dog to give the latter an up-and-down movementand with a pivoted or hinged arm or lever for engagement with a cam oreccentric on the driving shaft to operate said rock-shaft, and means foradjusting said pivoted or hinged lever, substantially as described, andfor the purpose set forth.

3. The combination, in a sewing-machine, with the main driving-shaft, afeed-dog horizontally reciprocated by a rock-shaft, a cam located onsaid driving-shaft, and a rod connecting said rock-shaft and cam, of asecondary rock-shaft provided at one end with an arm for engagement withsaid feed-dog and at its opposite end with a hinged or pivoted arm forengagement with an operating cam or eccentric on the driving-shaft, andaspring and adj usting-screw for adjusting the engaging end of saidpivoted lever in its relation to its engaging cam or eccentric,substantially as described, and for the purpose set forth.

4. The combination, in a sewing-machine, of a feed-dog horizontallyreciprocated by a lOO IIO

rock-shaft, connecting-rod, and a cam or ecis adjusted for a greater orless degree of con- 1o centric secured on the lower driving-shaft, antact with a cam or eccentric on the drivingintermedary rock-shaftprovided at ornear shaft to adjust the throw of said secondary one endwith an arm projecting beneath the rock-shaft, substantially asdescribed7 and for feed-dog, and a. supporting-roller to relieve thepurpose set forth.

the bearing-surface from friction and at or x VILLIAM A. MACK. .near itsopposite end With another arm or ex- Witnesses: tension having asecondary arm hinged at or MILO P. SMITH,

near.its center thereto, the free end of which FRANK MACK.

